             (f/map-to-pair (f/fn [x] [x 1]))
             (f/map f/untuple)
             f/collect
-            vec) => [["a" 1] ["b" 1] ["c" 1] ["d" 1]])
+            #_vec) => [["a" 1] ["b" 1] ["c" 1] ["d" 1]])
 
       (fact
         "reduce-by-key returns an RDD of (K, V) when called on an RDD of (K, V) pairs"

                              ["key2" 4]
                              ["key3" 5]])
            (f/count-by-key)) => {"key1" 2, "key2" 2, "key3" 1})
      )))

      (fact
        "similar to map, but each input item can be mapped to 0 or more output items;
        mapping function must therefore return a sequence rather than a single item"
        (-> (f/parallelize c [["Four score and seven years ago our fathers"]
                              ["brought forth on this continent a new nation"]])
            (f/flat-map (f/fn [x] (clojure.string/split (first x) #" ")))
            f/collect
            vec) => ["Four" "score" "and" "seven" "years" "ago" "our" "fathers" "brought" "forth" "on" "this" "continent" "a" "new" "nation"])

